Almost always a permissions issue.
(your user does not have permission to create that directory).
Launch LO from a console to try to catch the dir/file involved if still uncertain. The binary is called soffice.bin.
PS
:~$ /opt/libreoffice5.0/program/soffice.bin --version
LibreOffice 5.0.0.5 437e4abdf9e72fd0a6e6f8697a0e659bc77f9b10
Updated 1 Oct 2015:
“Running soffice.bin in Terminal I get:”
Fontconfig error: cannot load default config file
Hurrah! Now we have a chance of getting somewhere. This is the main reference that I find (check your error message to this one):-
http://www.linuxquestions.org/questions/slackware-14/fontconfig-error-470055/
“installed fontconfig and freetype & got the following error:”
Fontconfig error: Cannot load default config file
No fonts found; this probably means that the fontconfig
library is not correctly configured. You may need to
edit the fonts.conf configuration file. More information
about fontconfig can be found in the fontconfig(3) manual
page and on fontconfig.org
Fixed by “making a symlink in /usr/share to /usr/X11R6/lib/X11/fonts. /usr/share/fonts → /usr/share/lib/X11/fonts”. Ultimately, the problem was due to a partial install - it needed a proper upgrade of all relevant components within the distro to keep everything in sync.
If this helps then please tick the answer ()
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